The 650's and later bikes they addressed the frame flex issues. You'll notice one of the first things modified are the swing arms along with gusseting, front end and brakes. The more I pushed it, the more I needed these mods. I plan on squeezing even more ponies out of my bike. I hope to have these mods in place by the time I do.
Steve

Spent some time this weekend and today getting the bottom tension linkage lugs and tension linkages installed. I got the parts at Midwest controls. I made it adjustable so that I adjust the rear height. I am not proud of the weld quality but it should hold. Next move will be to pull the swing arm and scrub off the rear tabs for the old footrests/exhaust supports and clearance the for the chain at the frame.

Has anyone done a similar rear swap with a gsxr swing arm? I am looking at drive sprocket options out there. Does anyone have a ballpark offset that I will need?

If you're having tank slappers there' something wrong with the bike. Could be tires (that happened to me), swing arm bushings/bearings; steering stem bearings; shocks; forks; etc. Ed

I'd got the offset sprocket from Debben Preformance, and chucked it on (with a straight edge held against it for chain clearance reference).

And after routing through my drawers (madam!), I found a part-used 530 chain that originally came with the GSX-R1000 swinging arm that I have for another project, so popped that on too.

You can see that it hits the frame... Bugger.
Here's where I'll need to be pocketing the inside of the frame rails.

And, while I was here, I made up a cardboard mock-up of the oil tank for the turbo (I'll be running a seperate electric oil pump to oil the turbo, given that the air-cooled Kawasakis don't have great oil pressure)

After further scouring of the list I found a CBR900RR shock is also very close, and lo and behold I have one of them laying around.
I stuck it in there and it will require 2 things - the remote reservoir hose needs to be turned about 120 degrees, which will require a spacer, and I'll have to remake the bottom brackets under the swing arm. I'll post up some pics as I start the work.

Meanwhile, things were happening. Only little things, but at least something was being done. Small steps, but all in the right direction. Mostly.
The swinging arm shock mounts on the Martek arm were further apart (across the bike) than the standard Z650 mounts, but then you'd expect that when upgrading to a 180 section tyre I guess. I had originally been happy with the Maxton shocks sitting angled inwards from the new mounts to the standard upper ones, but over the last few years I'd grown less happy with them, so wanted the upper mounts moving outwards to match.

I found that a bloke on the Z1 Owners club forum was making adaptors that extended the shock mounts outwards, and somewhat conveniently they happened to be exactly the right dimensions to suit the shock mounts on the Martek arm. Yippee!

They'll need to be welded onto the frame, but that can happen when I do the frame mods for the chain run (oh, did I not mention the chain run issues...)
I was never happy with the bolts in the lower shock mounts, as they had threads running through the mounts, so I got a couple of bolts with long 'shoulders' that I re-threaded so that the shoulders ran through the shock and mounts and the thread was only up to the inside face of the mount.

This is in response to Swest's swing-arm question. It rides smooth, not bouncy, corners well. The lowering pieces are aftermarket the original owner installed. he had short legs. He also spent a lot of time in the hospital and laid up at home. Thus only 17,000 miles on the speedo....(he was a rodeo Bull rider.)

No I have not, but the shaft DOES prevent the side to side motion exactly as stock. The RH roller bearing is the lateral limiting device in the stock ZRX swing arm. It is trapped in a stock ZRX by the RH "top hat" bushing and the LH side sleeve that rides in the needle bearings. All of that is sandwiched between the frame mounts. All the stock ZRX bearings and the LH sleeve is retained and the "top hat" bushing feature for the RH is incorporated into the shaft I designed. Using grade 8 5/8" fine thread bolts to bolt the shaft into the frame holds everything tight and ridged. Mine fits like a glove.

As far as simple, it is one shaft with two bolts. Versus a long bolt, nut, and two individual bushings. So not sure it is more complicated.

Cory

I have my bike up in my buddy Erik’s garage (50km away) so there is a lot of things that need to work in order to get work done on the bike, and to make things worse Erik gave his daughter a Hoverboard for X-mas. Guess you can figure out the rest. . :blink: . . . yes there were some serious surgery :S needed to get him back in good working order again and the days we had set of around new years were lost.

Anyhow, we are back at it.

First up, fitting the Zephyr 750 swing arm.



The Gpz750R1 measures 230mm between the studs and the Zephyr 750 swing arm is 234mm, so while I shaved of 2mm on each side Erik milled the Zephyr pivot tube down to 230mm.



Secondly we had to deal with the fact that the swing bolt is 16mm and the id of the Zephyr pivot tube is 20mm. Our fix was to fit a piece of high precision steel tube that by chance had just that od/id inside the pivot tube.



And everything went on the bike like a charm.



In order to secure that the end seals stay in the swingarm, Erik made two spacers of delrin that fits over the studs in the frame and will stop the seals from getting out of the swingarm. (not in the picture)



Next up is fitting the wheels, which means changing the wheel bearings from 20mm id to 17mm to fit the Zephyr wheel axels and centering them in the frame.

Unfortunately we ran in to a little bit of a snag with the front wheel as it turned out that the donor bike, a ZXR400 has 210mm fork spacing and the Zephyr fork only 200mm which put the wheel ca 10mm of to the right. Bummer. :pinch:

/A

As KZB2 650 stated, with the mags on the bike, you must have a C (or D) model swingarm.
I believe the B models use the same bearings though.

There are different sleeves for the models that use bushings, and those that use bearings.
Parts 5 and 5A in the diagram:

The swingarm, when installed, should move easily.